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338 Excalibur brass group buy-Interest Thread
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<blockquote data-quote="Sling" data-source="post: 924347" data-attributes="member: 75373"><p>When I first had my Excaliber built, A-Square was the only source of brass. If memory serves me correctly, I got 400pcs from them. They had no loading data for the 300gr so I used 338-378 Weatherby data. While accuracy was great, I noticed sticky bolt even on virgin brass and this was still using Weatherby data, the EX holds more powder which means something wasnt right. I called A-Square and they said either I`m loading too hot or headspace was bad. I checked HS and it was good. I called A-Square again and talked to Art who mentioned their brass can`t handle pressure well once it get over 62,000PSI. So I decided to call Marc Jamison about this problem. We discussed this cartridge for some time before he agreed to make the brass for me. I sent him 2 fired cases along with the cartridge print. As soon as he received this, he said your sticky bolt problem is because there isn`t enough case taper. The Ex and the 338 Lapua has roughly the same head size, and that cartridges of this size need around .010-.012 per inch of body for ease of extraction once pressure gets above 60,000PSI. Marc called me back and said he was having trouble making the brass because of the lack of case taper. He kept trying even after losing 8 out of 10 cases. He went about it a different way and it finally worked. He sent me around 500 pcs of Ex brass and he warned me again that sticky bolt would still become an issue if loaded hotter than 60,000psi. I forgot to mention that Marc said his brass could handle up to 70,000PSI. I loaded that brass using QuickLoad and he was right, once pressure got around 60,000psi, sticky bolt again. I called Marc back and told him the situation. He said if I was interested he would add more case taper to the EX and call it the 338 Whatever, I say that (Whatever) because its between me & Marc as of now. By using 338-378 Weatherby loading data, that equates around 59,000-62,000PSI in the EX case according to Quickload. I know Quickload is "not" exact but close enough for me and other knowledgeable reloaders. Kirby Allen discusses this same problem with the EX in another thread. Thats why he added taper in his Raptor series of wildcats. I have never had a 338 Lapua Ackley IM. It has same problem, not enough case taper. I said a 338 Lapua Imp which is a 338 Lapua with .022 case taper with 35 degree shoulder, very similar to the 338 Yogi. Works great! 30-32" barrel, Retumbo or RL 33 will push 300gr Berger 3000fps or faster with easy extraction. So I was the first guinea pig to try the Jamison 338 Ex brass. The Jamison brass is great as I`ve shot it for years in the 408 & 375 Cheytac with no trouble. Hope this helps,</p><p> </p><p>Sling</p></blockquote><p></p>
[QUOTE="Sling, post: 924347, member: 75373"] When I first had my Excaliber built, A-Square was the only source of brass. If memory serves me correctly, I got 400pcs from them. They had no loading data for the 300gr so I used 338-378 Weatherby data. While accuracy was great, I noticed sticky bolt even on virgin brass and this was still using Weatherby data, the EX holds more powder which means something wasnt right. I called A-Square and they said either I`m loading too hot or headspace was bad. I checked HS and it was good. I called A-Square again and talked to Art who mentioned their brass can`t handle pressure well once it get over 62,000PSI. So I decided to call Marc Jamison about this problem. We discussed this cartridge for some time before he agreed to make the brass for me. I sent him 2 fired cases along with the cartridge print. As soon as he received this, he said your sticky bolt problem is because there isn`t enough case taper. The Ex and the 338 Lapua has roughly the same head size, and that cartridges of this size need around .010-.012 per inch of body for ease of extraction once pressure gets above 60,000PSI. Marc called me back and said he was having trouble making the brass because of the lack of case taper. He kept trying even after losing 8 out of 10 cases. He went about it a different way and it finally worked. He sent me around 500 pcs of Ex brass and he warned me again that sticky bolt would still become an issue if loaded hotter than 60,000psi. I forgot to mention that Marc said his brass could handle up to 70,000PSI. I loaded that brass using QuickLoad and he was right, once pressure got around 60,000psi, sticky bolt again. I called Marc back and told him the situation. He said if I was interested he would add more case taper to the EX and call it the 338 Whatever, I say that (Whatever) because its between me & Marc as of now. By using 338-378 Weatherby loading data, that equates around 59,000-62,000PSI in the EX case according to Quickload. I know Quickload is "not" exact but close enough for me and other knowledgeable reloaders. Kirby Allen discusses this same problem with the EX in another thread. Thats why he added taper in his Raptor series of wildcats. I have never had a 338 Lapua Ackley IM. It has same problem, not enough case taper. I said a 338 Lapua Imp which is a 338 Lapua with .022 case taper with 35 degree shoulder, very similar to the 338 Yogi. Works great! 30-32" barrel, Retumbo or RL 33 will push 300gr Berger 3000fps or faster with easy extraction. So I was the first guinea pig to try the Jamison 338 Ex brass. The Jamison brass is great as I`ve shot it for years in the 408 & 375 Cheytac with no trouble. Hope this helps, Sling [/QUOTE]
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